Activation of P2X(7) receptor by ATP plays an important role in regulating inflammatory responses during acute viral infection.

PloS One
Benjamin H LeeJim Hu

Abstract

Acute viral infection causes damages to the host due to uncontrolled viral replication but even replication deficient viral vectors can induce systemic inflammatory responses. Indeed, overactive host innate immune responses to viral vectors have led to devastating consequences. Macrophages are important innate immune cells that recognize viruses and induce inflammatory responses at the early stage of infection. However, tissue resident macrophages are not easily activated by the mere presence of virus suggesting that their activation requires additional signals from other cells in the tissue in order to trigger inflammatory responses. Previously, we have shown that the cross-talk between epithelial cells and macrophages generates synergistic inflammatory responses during adenoviral vector infection. Here, we investigated whether ATP is involved in the activation of macrophages to induce inflammatory responses during an acute adenoviral infection. Using a macrophage-epithelial cell co-culture system we demonstrated that ATP signaling through P2X(7) receptor (P2X(7)R) is required for induction of inflammatory mediators. We also showed that ATP-P2X(7)R signaling regulates inflammasome activation as inhibition or deficiency of P2X(...Continue Reading

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Methods Mentioned

BETA
flow cytometry
FACS
ELISA
immunoprecipitation
bronchoalveolar lavage
lavage

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